package com.glsc.ngateway.common.api.common.utils.encrypt;

import com.glsc.ngateway.common.api.common.enums.PlatformConstant;
import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;

public class RSAEncrypt {
    private static Map<Integer, String> keyMap = new HashMap<Integer, String>();  //用于封装随机产生的公钥与私钥

    public static void main(String[] args) throws Exception {
        //生成公钥和私钥
        genKeyPair();
        //加密字符串
        String message = "glam&601456";


        String publickey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCEms2H/y5vgTIge4/lWEQxaYtwwM7pgC0wD/2+do51u3PMUmZ3sdBcG2JhHAxrMljl8nyBaByLowlw8uqGTPBI+A7QHjiI2Wx9OmzCgRKdfUIir5UG+WUzjSDEELXCsoNKtCa/XBJk7W388b4orqAOWNzXTbIE945gAidWf2UuEQIDAQAB";
        System.out.println("随机生成的公钥为:" + keyMap.get(0));

        String privateKey = "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\n" +
                "df723820";


        String messageEn = encrypt(message, publickey);

        System.out.println("字符串长度为：" + messageEn.length());
        System.out.println(message + "\t加密后的字符串为:" + messageEn);

        //messageEn = "cQ0PC8zUCe5oZl655whGRcdOTjd0yDVhJ4rc43sfvtgGEU2a9lTPqXUZKfuSDHdJeJLeIpKFXkg0zlc4rVqwwvSj1oe9nu8NADOZTynSZ6/W91/mlvar8fC8L/VPgPt48nkLCIVj28dXHMNF49GZZ3VG/gYaE0XYASAthVQhOQ4=";
        String messageDe = decrypt(messageEn, PlatformConstant.RSA_PRIVATE_KEY);
        System.out.println("还原后的字符串为:" + messageDe);
    }

    /**
     * 随机生成密钥对
     *
     * @throws NoSuchAlgorithmException
     */
    public static void genKeyPair() throws NoSuchAlgorithmException {
        // KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象
        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");


        // 初始化密钥对生成器，密钥大小为96-1024位
        keyPairGen.initialize(1024, new SecureRandom());
        // 生成一个密钥对，保存在keyPair中
        KeyPair keyPair = keyPairGen.generateKeyPair();
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();   // 得到私钥
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();  // 得到公钥
        String publicKeyString = new String(Base64.encodeBase64(publicKey.getEncoded()));
        // 得到私钥字符串
        String privateKeyString = new String(Base64.encodeBase64((privateKey.getEncoded())));
        // 将公钥和私钥保存到Map
        keyMap.put(0, publicKeyString);  //0表示公钥
        keyMap.put(1, privateKeyString);  //1表示私钥
    }

    public static String encrypt(String str) throws Exception {
        return encrypt(str, PlatformConstant.RSA_PUBLIC_KEY);
    }
    /**
     * RSA公钥加密
     *
     * @param str       加密字符串
     * @param publicKey 公钥
     * @return 密文
     * @throws Exception 加密过程中的异常信息
     */
    public static String encrypt(String str, String publicKey) throws Exception {
        //base64编码的公钥
        byte[] decoded = Base64.decodeBase64(publicKey);
        RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded));
        //RSA加密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, pubKey);
        String outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes("UTF-8")));
        return outStr;
    }

    public static String decrypt(String str) throws Exception {
        return decrypt(str, PlatformConstant.RSA_PRIVATE_KEY);
    }

    /**
     * RSA私钥解密
     *
     * @param str        加密字符串
     * @param privateKey 私钥
     * @return 铭文
     * @throws Exception 解密过程中的异常信息
     */
    public static String decrypt(String str, String privateKey) throws Exception {
        //64位解码加密后的字符串
        byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8"));
        //base64编码的私钥
        byte[] decoded = Base64.decodeBase64(privateKey);
        RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded));
        //RSA解密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, priKey);
        String outStr = new String(cipher.doFinal(inputByte));
        return outStr;
    }

}
